1269261320 has 128 divisors (see below), whose sum is σ = 3049436160. Its totient is φ = 474808320.

The previous prime is 1269261317. The next prime is 1269261341. The reversal of 1269261320 is 231629621.

It is a happy number.

It is a super-2 number, since 2×1269261320² = 3222048596896284800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4938632 + ... + 4938888.

It is an arithmetic number, because the mean of its divisors is an integer number (23823720).

Almost surely, 2^1269261320 is an apocalyptic number.

1269261320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1269261320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524718080).

1269261320 is an abundant number, since it is smaller than the sum of its proper divisors (1780174840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1269261320 is a wasteful number, since it uses less digits than its factorization.

1269261320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1269261320 is about 35626.6939246403. The cubic root of 1269261320 is about 1082.7221340263.

The spelling of 1269261320 in words is "one billion, two hundred sixty-nine million, two hundred sixty-one thousand, three hundred twenty".